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I F. SATTERSTROM. ELECTRICAL ACTUATING MEANS FOR TYPEWRITER TYPE BARS AND OTHER DEVICES.

' APPLICATION FILED OCT- 29, 1920- v 1 ,395,600. Patented Nov. 1, 1921.

2 SHEETS-SHEEN I.

v F. SATTERSTROM. ELECTRICAL ACTUATtNG MEANS FOR TYPEWRITER TYPE BARS AND OTHER D EVI-CES.

APPLICATION FILED OCT. 29, 1920- 1 ,395,600. Patented Nov. 1, 1921.

2 SHEETS-SHEE] 2.

27 26 Mara/W01? rra/a/xE/J FERDINAND SATTERSTROM, 0T HASTINGS, MINNESOTA, ASSIGNOR To MAGNETIC POWER TRANSMITTER COMPANY, on FARIBAULT, MINNESOTA, A oonronn- 'IION OF MINNESOTA.

ELECTRICAL AGT'UATING MEANS FOR TYPEWRITER TYPE-BARS AND OTHER DEVICES.

Specification of Letters Patent.

Patented Nov. 1, 1921.

Application filed October 29, 1920. Serial No. 420,485.

To all whom it may concern:

Be it known that I, FERDINAND SATT STROM, a citizen of the United States, resident of Hastings, in the county of Dakota and State of Minnesota, have invented certain new and useful Improvements in Electrical Actuating Means for Typewriter Type-Bars and other Devices, of which the following is a specification.

This invention relates to improvements in electrical actuating means designed particularly for actuating the type bars of typewriters, though capable of being used for operating many other key-controlled devices, such as type-setters, type-casting mechamsni and adding or calculating machines The present invention is an improvement upon the mechanism illustrated and described in my pending application for Patent No. 355,487, filed January 31st, 1920.

In my said pending application I have illustrated a mechanism provided with a series of selective magnets arranged, when any key of the mechanism is depressed',to throw a type-bar actuating device into position to be moved by an operating magnet causing a suitable impression to be made by the type carried by the actuated type bar.

In my said formen application I have illustrated a plurality of operating or power magnets by means of which each type-bar is moved with the full forc'eof the magnets, tov

make an impression upon the paper in the machine. o

It is the object of my present invention to improve themechanism of my former'application, whereby the'type-bars will be actuaated at the beginning and during aconsiderable portion of their movement, by a plurality of magnets, while only a single magnet will be exerting -its power upon the typebar when it is brought into printing position.

My present invention consists generally in a type-bar actuating mechanism provided with a plurality ofactu'ating magnets, and means for causing one or more of the magnets to cease exerting power upon the type-bar before it reaches the end of its printing movement.

Other objects of the invention will appear Figure 1 is a side elevation, partial sec tion and diagram, illustrating my presentmprovement.

Fig; 2 is a similar View showing one of the type-bars in printing position, the electrlc circuit for the actuating magnet being shown closed by the depression of a key I Fig. 3 s a detail section through the pair of operatlng magnets, in this instance in the form of solenoids,

Figs. 4: and 5 are detail showing the manner of connecting the actuating bar of the machine with the armatures of the actuating magnets. I

In-the drawings, 2 represents the frame of a portion of a typewritiiig machine, which furnishes support for type-bars 3 each of which is provided with a suitable type 4. As illustrated in my said former application said type bars will usually be arranged in a semi-circular group and the frame as here shown is preferably provided with a plate 5 to which type-bar supporting lugs are secured. The type-bars 3 are pivoted to the lugs 6, preferably at the point 7 a short distance from the end of the type-bar. A typebar actuating lever 8 is pivoted to a bracket 9 arranged on the frame of the machine. The lever 8 and the. rear end of the type-bar 3 are connected by a-link 10. Preferably the type-bars are arranged to tand noranally in a nearly vertical position, with the rear ends of the type-heads resting against These members are preferably in the form of bars arranged in substantially vertical posltion and passing through slots 13 in a slotted guide-plate 14. Normally the nieinhers stand at the rear end of the slot, and

are preferably arranged to rest against the bar l5e'xtending across the plate 14. The lower end of each connecting member 12 is preferably provided with an off-set 1.6, to

which is" connected a suitable spring 17, the opposite end of the pring being suitably connected to the stationary part of the frame. These springs tend to hold the connecting members 12 at all times with their rear edges against the bar 15, as-shown by full lines in Fig. 1 of the drawings. The actuating levers 8 preferably extend through and 2 of the drawings.

Each connecting member 12 is preferably provided at its upper end, with a shoulder forming this portion of the member into a laterally extending hook 19 as. shown in Figs. 1 and 2.

mounted upon suitable supports on the frame of the machine. Each of these magnets is provided with a pivoted armature 21 extending longitudinally of the magnet, and passing preferably laterally by both poles thereof, whereby when the magnet is not energized by the passage of an electric current therethrough, the armature will stand in the position shown in full lines in Fig. 1 of the drawings. The armatures 21 are connected by suitable links 23, with the connecting members 12, whereby whenany selecting magnet is energized its armature will be drawn toward the magnet and thecorresponding connecting member 12 will be moved from the position shown in full lines in Fig. 1, to the position shown by dotted lines in Fig. 1 and by full lines in Fig. 2.

Arranged in close proximity to the connecting members 12 is a universal actuating or power bar 24, preferably supported by arms 25 upon a rock shaft 26. As here shown the shaft 26 is mounted in bearings 31 on the machine frame, and is provided near its end with the crank arms 27 and 28,

these crank arms being'connected to the armatures 29, 29 of the operating magnets 30 and 30'. a g

I have here shown two of the operating magnets 30, 30' one arranged near each side of the machine. For carrying out my present improvement two or more magnets are required.

As here shown the magnets 30 and 30 are in the form of solenoids and the armatures 29, 29 are in the form of cores arranged to slide within said solenoids, and each solenoid is provided with a stationary corepiece 31, 31', against which the end of the sliding core or armature strikes when the core has reached the end of its sliding movement within the solenoid.

The sliding cores or armatures 29,29 are each preferably provided at its outer end with a fork 32 across which extends a pin 33. The crank arm 27 has a fork 27 that engages the pin 33 in the fork 32 of the sliding core or armature 29. The crank arm 28 is provided with a lug 28' extendin .above and inside the pin 33 in the fork of t e sliding core or armature 29'.

It will be understood that when the solenoids 30, 30 are energized by the passage of an electric current therethrough the cores or armatures 29, '29 will slide inward until their ends abut against the stationary corepieces 31, 31..

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As here shown the core-pieces 31, 31' are of substantially the same length or extend to substantially the same point .in each solenoid while the sliding core or armature 29 is somewhat longer. than the corresponding core-piece or armature 29. When the magnets are energized both of the sliding cores A series of selecting magnets 20 are or armatures are drawn inward and the power-of both magnets is exerted to move the type-bar whose connecting device has been brought into actuating position by the action of the corresponding selective magnet. The ,full force of both magnets, therefore, will be exerted to move the type-bar and type carried thereby so long as both armatures are moving under the influence of the magnets. "Before, however, the type is brought into'a position to make an impression upon the paper'the magnet 29' is stopped by its end abutting against the corepiece 31, and the further movement of the rock shaft 26 and the devices actuated thereby, is causedby the action of the'magnet 30 through the sliding core or armature 29. The arrangement shown in Fig. 4 of'the drawings wherein the arm28'is provided with a projection 28 extending inside of the pin 33, with no connection upon the outside of said pin, permits the arm 28 to move inward as indicated by dotted lines in Fig. 4 after the sliding core-or armature 29 has been stopped by its contact with the corepiece 31. Y

I have shown and described two magnets or solenoids for actuating the power bar 24. Both of these magnets as explained exert power upon this bar during the early part of the movement thereof, while only one magnet is acting upon the bar at and near the end of its stroke. I have found two magnets sufficient for 'the' purpose of actuating in a satisfactory manner the type-bars of a type-writing machine. I may use, however,

more than two magnets, stopping the action thereof at different points in the movement of the power-bar and the devices actuated 3 thereby. I, therefore,do not wish to limit myself to any'particular number of solenoids or magnets for actuating the powerbar. Any suitable number greater than one may be so employed. V.

Nor do I wish to limit myself to the sole-' noid form of magnet. The same'principle may be applied to the usual magnets, of the 7 form shown and describedin my said former magnets, or, Where more than two magnets are employed, I may denergize the magnets successively from the beginning of the operation toward the close thereof, so that all of the magnets are exerting power at the beginning of the movement, While said power is decreased, as desired, and if preferred only a single magnet is in operation at or near the final operation of the device.

I have illustrated in the drawings substantially the same arrangement shown in my former application for energizing the magnets by the movement of a suitable key. This arrangement is fully described and claimed in my said former application and it is unnecessary to describe this arrangement herein, as it forms no part of my present invention.

I do not limit myself to the details of the construction and arrangement herein shown and described as the same may be varied in many particulars Without departing from my invention.

I claim as my invention:

1. In an electrical actuating mechanism of the class described, the combination with a movable power-bar or member, of a plurality of magnets, armatures connected to and cooperating with said bar, and arranged to be actuated by said magnets, and means stopping the movement of one ofthe armatures before the other armature reaches the limit of its movement.

2. In an electrical actuating mechanism of the class described, the combination, with a movable power-bar or member, of a plurality of magnets, a plurality of armatures connected to and cooperating with said bar, and arranged to be actuated by said magnets, and means for successively limiting the movement of said armatures, for the purpose set forth.

3. In an electrical actuating mechanism of the class described, the combination with a movable power-bar or member, of a plurality of magnets, a corresponding plurality of armatures, connected to and cooperating with said bar, and arranged to be simultaneously actuated by said magnets at the beginning of their movement, and means for successively limiting the movements of said armatures, for the purpose set forth.

4-. In an electrical actuating mechanism of the class described, the combination, with a movable power-bar, of a plurality of solenoid magnets, a corresponding plurality of sliding cores or armatures connected to and cooperating with said bar, and arranged to be simultaneously actuated by said magnets at the beginning of their movement, and means for successively limiting the movement of said armatures, for the purpose set forth.

5. In an electrical actuating mechanism of the class described, the combination, with a movable power-bar or member, of a plurality of magnets, a corresponding plurality of armatures, connected to and cooperating with said bar, and arranged to be simultaneously actuated by said magnets atthe beginning of their movement, and means for causing said armatures to successively discon tinue or cease their pulling efiect upon said bar or member, substantially as described.

In witness whereof, I have hereunto set my hand this 15th day of October, 1920.

FERDINAND SATTEIRSTROM. 

